Acentuada diferenciação regional numa espécie de caranguejo norte americana ao longo da sua distribuição de origem e em estuários europeus: análise filogeográfica e considerações ecológicas
Bibliographic record
Abstract
Rhithropanopeus harrisii (Gould 1841) tem uma distribuição nativa desde o Canadá até ao México e é considerada uma espécie invasora nos rios e estuários da costa noroeste e sudeste do continente americano e na costa Europeia, onde foi descoberto antes de 1874, na Holanda. Neste estudo uma parte do gene citocrómio oxidase subunidade I foi analisada em populações dos EUA e da Europa, de modo a obter a informação sobre a diversidade genética das populações e sobre uma potencial população de origem. Análises morfométricas foram efetuadas através de medições da carapaça. Um gargalo genético deverá ter ocorrido aquando da colonização Europeia e Nova Jersey é a população que mais se assemelha geneticamente à potencial população de origem. A heterogeneidade genética ao longo da costa este dos EUA e da costa Europeia tomou-se evidente. Pela análise morfométrica não foi possível discriminar as populações. Verifica-se que esta espécie ainda se encontra em expansão e que pode usar vários vetores de invasão. /ABSTRACT - Rhithropanopeus harrisii (Gould 1841) has a native distribution from Canada to Mexico and is considered an invasive species in northwestem American, southeastem American and European estuaries and rivers. In Europe it was observed for the first time before 1874, in The Netherlands. In this study we analyzed a part of cytochrome oxidase subunit I gene of populations from the east coast of United States of America and from Europe, in order to assess to a the genetic diversity of the populations and to determine a potential founder population. Morphometric analyses were also performed using measurements of the carapace. A genetic bottleneck might have occurred during the European colonization. New Jersey is the most similar population to the potential founding population and there is evidence of genetic heterogeneity along the North American east coast and European coast. It was not possible to discriminate all populations morphometrically. R. harrisii is still in expansion and might use several invasion mechanisms.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".